Weighing-scale.



G, M. GUNWAY.

WEIGHING SCALE. APPLIOATVION FILED SEPT. 23, 1909'.

1,1 16,563. Patented Nov. 10, 1914.

FIG.

WWI I!!! 5 INVENTOR WITNESSES: 6% 6 $1M [vy Azt'owwys,

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(Fa efs'i weighed, and the left pan holder G is designed to carry the main or counterbalancing weight. This Weight is indicated in dotted lines at P and the receptacle in dotted lines at R. The function of the main tare weight L is to approximately counterbalance the receptacle, for which purpose it is moved to the left along its beam. For making a series of tests the weight L may be adjusted in to substantially counterbalance the average weight of the receptacles, the precise weight of each receptacle being compensated for by a final adjustment of the auxiliary tare rider L, and the tare for each receptacle it separately recorded; for this purpose the auxiliary tare beam should be graduated to both sides of the middle or zero position as shown, so that the plus or minus weight indicated by the position of the auxiliary tare 2o runner may be separately recorded.

In describing the operation, I will assume as a suitable example that the scale is to be used for determining the percentage of moisture in butter. A receptacle is first placed on the pan holder G and its tare weighed off and recorded as described. After this the position of the main tareweight L is left unchanged during the entire series of tests. Any prescribed weight P (say for as example ten grams) is then placed on the pan holder G, and the. same weight of butter is placed in the receptacle, so that the scale balances. The receptacle containing the butter is then placed in an oven and heated to 333 drive oil the moisture. While this is being done other samples may be weighed, the tare of each receptacle being recorded. The heated sample of butter is then placed again on the pan holder G, having now lost weight to by the loss of its moisture. The auxiliary tare weight L is re-set according to the rehorded position. The scale is now out of balance because of the loss of weight of the butter, and this loss iscompensated for by 4.5 sliding one or both of the percentage runners M M toward the right until the scale is again brought to balance. If only one of the weights M or M has been displaced, the

percentage of loss may be read off from its scale beam withoutany computation; but if both weights have been displaced it is of course necessary to add together the percentages indicated on their respective beams. Thus in Fig. 1 the weight M stands at 1% and M at .4, so that the percentage of loss is 14.4. After each weighing operation the runners are restored for the next operation.

The scale will of course be proportioned according to the uses to which it is to be to put, so that the percentage beams will be graduated accordingly. For example, in the construction shown, the lower beam is glad uated to 20 per cent., and the upper one to 10 per cent, making a total of 30 per cent.,

ilacs? which represents the maximum loss of weight of the material under test for which this -'particular scale is adapted. The use of two percentage beams with respectively finer and coarser graduations, facilitates accuracy in weighing, it being convenient to adjust the main or heavier weight to an exact percentage, and to weigh oh" the fractional difference on the auxiliary beam, where the lighter runner moves over coarser graduations.

The scale is shown as provided with the usual pointer Q moving over a fixed graduation S, the pointer Q in this instance being mounted on a frame Q fixed to the lower beam C, but any other or equivalent arrange.- ment may be provided.

I am aware that various constructions of percentage scales have been proposed. Commonly such scales have required that the main weight be adjusted along its beam. In my scale the main weight P is undisturbed, except that it is removed when weighing the tare and applied when weighing the sample of material.

It will be understood that those features of the scale which form nonovel part of my invention may be substituted by any of the well known equivalents in the scale making art. For example, my invention is not limited to the use of pan holders G and G for receiving the weight P and receptacle R,

any equivalent provisions for receiving or suspending these parts being applicable in lieu thereof.

I claim as my invention 1,. A percentage scale comprising a multiple beam having graduated numbers, a main weight, provisions for applying to the opposite arms of said beam at fixed points the material to be weighed and said main weight respectively, a tare runner slidable on a graduated member of said beam, and a percentage runner slidable on another grad uated member of said beam, said latter member being inversely graduated with the numbers counting upwardly from the end carrying the main weight and proportioned to said main weight and to said percentage runner, so that the poising position of the percentage runner thereon indicates the percentage of loss of weight of the material.

2. A percentage scale comprising a mul tiple beam having graduated. numbers, a main weight, provisions for applying to the opposite arms of said beam at fixed points 1 the material to be weighed and said main weight respectively, a tare runner slidable on a graduated member of said beam, and a percentage runner slidable l 11 another graduated member of said beam. said latter mem ber extending across the fulcrum point of the beam and inversely graduated with its numbers counting upwardly from the end carrying the main weight, and continuing across such fulcrum point and proportioned my name in the presencebf two subscribing to said mam Wei ht and t0 said ercentage runner, so that t e poising ositlon of the wltnesses.

GEORGE M. CONWAY. percentage runner thereon 1n icates the per- Witnesses: 6 cemtag'eiof loss of weight of the material. ARTHUR O. FRASER,

In witness whereof,I have hereunto signed .FRED WHITE. 

